LTPS Array Substrate Integrating Piezoelectric Pressure Sensors
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Solution Overview
Problem
Conventional touch pressure control display panels with add-on type pressure sensors suffer from low sensitivity due to sensors being far from the cover glass, resulting in increased thickness and weight of mobile devices.
Innovation Solution
Integration of pressure sensors within the LTPS array substrate, utilizing a layered structure with piezoelectric material-based pressure sensitive plates and transparent metal electrodes, reducing the distance between sensors and the cover glass, and eliminating the need for additional manufacturing steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If add-on type pressure sensors are used, then touch pressure control function is achieved, but sensitivity is low due to distance from cover glass
Solution Approach 1:
The patent merges the pressure sensor functionality directly into the display panel structure by integrating pressure-sensitive plates between the cover glass and the liquid crystal layer. This eliminates the need for separate add-on sensors and reduces the distance between the sensing element and the cover glass, thereby improving touch pressure sensitivity.
Solution Approach 2:
The pressure-sensitive plates are nested within the existing display panel layers, specifically positioned between the cover glass and the liquid crystal layer. This nested integration allows the pressure sensing function to be embedded within the display structure without adding external components, reducing the sensor-to-glass distance.
2Ease of operation
If add-on type pressure sensors are used, then touch pressure control function is achieved, but thickness and weight of display module increase
Solution Approach 1:
The patent combines the pressure sensing function with the existing display panel structure by integrating pressure-sensitive plates within the panel layers. This merging eliminates the need for separate add-on sensor assemblies, thereby reducing the overall weight of the display module while maintaining touch pressure control functionality.
Solution Approach 2:
The display panel structure is designed to serve multiple functions: displaying visual information and sensing touch pressure. By making the pressure-sensitive plates an integral part of the panel structure, the display module achieves multi-functionality without requiring additional separate components, thus reducing weight.
3Ease of operation
If add-on type pressure sensors are used, then touch pressure control function is achieved, but manufacturing cost increases due to additional substrates and attaching steps
Solution Approach 1:
The patent merges the pressure sensor manufacturing process with the existing display panel fabrication process. The pressure-sensitive plates are formed using the same substrate and manufacturing steps as the display panel itself, eliminating the need for separate substrate preparation and attaching operations. This integration reduces manufacturing complexity and cost.
Solution Approach 2:
The display panel structure itself serves the dual purpose of displaying images and sensing pressure. The pressure-sensitive plates are created as an inherent part of the panel structure during normal manufacturing, rather than requiring external sensor components to be separately manufactured and attached. This self-service approach eliminates additional manufacturing steps and costs.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enhanced touch pressure sensitivity and reduced thickness of the display module, while maintaining compatibility with current manufacturing processes without additional costs or complexity.
Implementation Method 1
a plurality of pressure sensitive plates formed in the organic layer, wherein the pressure sensitive plates are made of a piezoelectric material
Data Source
AI summary
A low temperature poly-silicon (LTPS) array substrate is provided. The LTPS array substrate includes a substrate, a gate electrode insulating layer, an interlayer insulating layer, an organic layer, and a plurality of pressure sensitive plates that are stacked on one another. The pressure sensitive plates are formed on the organic layer. The LTPS array substrate further includes a metal layer formed on the organic layer, and the metal layer has a pattern of a plurality of common electrodes and a plurality of pressure sensitive lines that are insulated from each other. The pressure sensitive lines are connected to the pressure sensitive plates.